modelMixingVolumeMassFlow
Test model for mass flow into and out of volume
Extends from Modelica.Icons.Example (Icon for runnable examples).
Information
This model demonstrates the use of the mixing volume with air flowing into and out of the volume.
The initial conditions for the volume is declared as fixed initial
values for the energy dynamics, but free initial conditions
for the mass dynamics. The reason for leaving the initial conditions
unspecified for the mass dynamics is that the sink bou
declares the pressure of the fluid. As there is no flow resistance
between that boundary condition and the volume,
the volume has the same pressure. Therefore, specifying an
initial condition for the mass dynamics would yield to an overspecified
initial value problem for the pressure of the medium.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.PressureDifference | dp_nominal | 10 | Nominal pressure drop |
| Modelica.Units.SI.MassFlowRate | m_flow_nominal | 0.5 | Nominal mass flow rate |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Fluid.Sources.MassFlowSource_T | sou | Flow source and sink | |
| Sources.Boundary_pT | bou | Boundary condition | |
| Buildings.Fluid.MixingVolumes.MixingVolume | vol |
Contents
| Name | Description |
|---|---|
 Medium | Medium model |
Revisions
-
January 22, 2016, by Michael Wetter:
Corrected type declaration of pressure difference. This is for #404. -
March 27, 2015 by Michael Wetter:
Set the mass dynamics of the volume toModelica.Fluid.Types.Dynamics.DynamicFreeInitialto avoid an overspecified but consistent initial value problem. The previous implementation caused a warning in Dymola 2015 FD01, and caused in Dymola 2016 beta 2 to not translate the model. The problem was that the boundary condition and the volume both declared an equation for the initial pressure. -
October 12, 2009 by Michael Wetter:
First implementation.